diff --git a/dll/shellext/stobject/power.cpp b/dll/shellext/stobject/power.cpp
index 9d80665dc87..ecae456b66e 100644
--- a/dll/shellext/stobject/power.cpp
+++ b/dll/shellext/stobject/power.cpp
@@ -90,6 +90,12 @@ static HICON DynamicLoadIcon(HINSTANCE hinst)
     }
 
     if (((PowerStatus.BatteryFlag & BATTERY_FLAG_NO_BATTERY) == 0) &&
+        (PowerStatus.BatteryLifePercent == BATTERY_PERCENTAGE_UNKNOWN))
+    {
+        hBatIcon = LoadIcon(hinst, MAKEINTRESOURCE(IDI_BATTCAP_ERR));
+        g_strTooltip.LoadStringW(IDS_PWR_UNKNOWN_REMAINING);
+    }
+    else if (((PowerStatus.BatteryFlag & BATTERY_FLAG_NO_BATTERY) == 0) &&
         ((PowerStatus.BatteryFlag & BATTERY_FLAG_CHARGING) == BATTERY_FLAG_CHARGING))
     {
         index = Quantize(PowerStatus.BatteryLifePercent);